You can set most, but not all, of the sounds to 'None'. There still seem to be a bunch of sounds that you can't control. And manually configuring the whole phone to be silent is quite time consuming, especially since you have to may have to do it for individual apps, which may or may not even support it.
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Can you set ringtones on the iphone? If so can't you just record nothing and set that as the text acknowledgement tone?
You can set most, but not all, of the sounds to 'None'. There still seem to be a bunch of sounds that you can't control. And manually configuring the whole phone to be silent is quite time consuming, especially since you have to may have to do it for individual apps, which may or may not even support it.